the fbi launch aid voter intimidation investigation into a political dirty trick. in ohio and wisconsin, billboards like these started popping up in mainly minority communities. warning voter fraud is a felony. >> this billboard is a symbol of unadulterated voter suppression to target an african-american community. >> reporter: after the controversy exploded, the billboards came down, but the tensions remain. as the election approaches, the most likely legal battles will include access to the polls. of sunday florida voters became outraged when the polls were temporarily closed after they stood in line for hours. pierre thomas, abc news, new york. >> we want to tell you what measures you can take to make sure your vote won't be called into question. >> let's take a listen to what abc's political contributor donna brazile had to say about this. >> remind every citizen they have the right to vote. standing in line as polls close. they may cast their ballot. bring voter registration card, i.d. if you have a utility bill, current utility bill, please bring that as well